Milling-machine



(No Model.) 2 Sneak-Sheet 1..

G. G. NEWTON.

MILLING MACHINE. No. 582,081. Patented Ma 4 2 Sheets-Sheet 2.

Patented May 4, 1897.

O. O. NEWTON. MILLING MACHINE.

InugnRr:

l/Hl

(No Model.)

Witnesses:

ITE starts AIEI rricn.

CHARLES C. NEIVTON, 0F PHILADELPHIA, PENNSYLVANIA,

MlLLlNG MACHlNE.

SPECIFICATION forming part of Letters Patent No. 582,081, dated May 4, 1897. A li ti fi fil d December 10, 1896. Serial No. 615,173. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES C. NEWTON, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Milling-Machines, of which the following is a specification.

The object of my invention is to provide for the effective lubrication of the cutters of a milling-tool, an object which I attain in the manner hereinafter set forth, reference being had to the accompanying drawings,in which- Figure 1 is a view, partly in longitudinal section and partly in elevation, of a millingtool provided with lubricating devices constructed in accordance with my invention. Fig. 2 is a view showing the application of the invention to a builtup tool having a nu 1nber of independent cutters. Fig. 3 is a face view of one of said cutters. Fig. 4 is a sectional view of a facing-cutterembodying the invention. Fig. 5 is a-front view of said outter, and Figs. 6 and '7 are longitudinal sectional views illustrating other embodiments of my invention.

The milling tool or cutter shown in Fig. 1 is mounted upon a hollow mandrel 1, which is adapted to turn at one end in a hollow bearing 2, from which projects a pipe 3, connected by a flexible tube 4, or in some other convenient manner, with a reservoir of oil or other lubricant either elevated or under pressure, so as to cause a constant flow of the lubricant into the hollow mandrel.

The milling-cutter 5, Fig. 1, is a cylindrical cutter having inclined external rows of cut-. ting-teeth 6 alternating with grooves '7, which grooves are in communication, through passages 8, with a central chamber 9 of the cylinder, this chamber in turn being in communication, through radial openings 10 in the hollow mandrel, with the central aperture or passage 11 of said mandrel.

The cutter is confined in place between a shoulder at one end of the mandrel and a washer 12, upon which bears a nut 13, adapted to a threaded portion of the mandrel, al-

though any other desired means for securing the cutter in place upon the mandrel may be adopted without departing from my invention.

WVhen the cutter is in operation, lubricant finds its way from the central chamber 11 of the mandrel through the passages 10 into the central chamber 9 of the cutter, and thence through the passages 8 to the grooves between the rows of teeth, so that the forward or cutting faces of these teeth are constantly lubricated, and the operation of the tool is thereby materially facilitated. Furthermore, the flow of lubricant through the body of the cutter tends to prevent heating of the same, and the presence of the openings in the body of the cutter insures a more nearly uniform hardening of the same when it is being manufactured than is possible when the body of the cutter is solid, as usual.

In the construction shown in Figs. 2 and 3 each of the individual cuttersla of the .series has an annular chamber 15, communicating through radial passages 16 with the toothed surface of the cutter, the mandrel in this case having one or more external longitudinal grooves or channels 17, so that the annular chambers of all of the cutters may be in communication with the central chamber of the mandrel.

In thefacing-cutter (shown in Figs. 4 and 5) the cutter-head has radial channels 18, which communicate with transverse channels 19, adjacent to the inner face of each cutter 20, that portion of the mandrel which receives the cutter-head having an annular chamber 21, which communicates with the various passages 18 of the cutter-head and also communicates, through radial passages 22, with the central chamber of the mandrel.

In Fig. 6 I have shown a machine in which the supply pipe 3 communicates directly with the central chamber of the hollow rotating mandrel or tool-holder 2 through a stufling-boX 28 at the end of the same, and in Fig. 7 I have shown the application of my invention to a gear-tooth cutter, the channels for the flow of lubricant being formed in the flanking-washers 24,which confine the cutter, instead of being formed in the cutter itself. In some cases the channels formed in the various tools for the flow of lubricant may be used for the flow of air or water without departing from the essential features of my invention.

In all of the tools shown the cutting-surface is at the outer portion of the tool, so that passages extend outwardly from the central chamber of the mandrel to such cutting-surfaces. Hence when the tool is rotated centrifugal force serves as an eflicient aid in causing the free flow of lubricant'to the cutting-surface of the tool. In this respect my invention differs from that class of lubricating devices which are applied to stationary tools and to lubricating devices applied to tools which cut at the end instead of at the outer or peripheral portion.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination of the hollow mandrel and the cutter structure mounted thereupon, said parts having formed therein radial passages and an annular chamber interposed between said radial passages, whereby lubricant from the hollow mandrel is distributed to the surface of the cutter, with means for 20 supplying lubricant to said hollow mandrel, substantially as specified.

2. The combination of the hollow mandrel having radial passages communicating with an external longitudinal channel, a cutter structure mounted on the mandrel, and having annular chambers communicating with said longitudinal channel and also with the outer toothed surface of the cutter, and means for supplying lubricant to the hollow man- 0 drel, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES C. NEIVTON.

lVitnesses:

E. J. I'IANNUM, J 0s. II. KLEIN. 

